fjärrsensing
Fjärrsensing, or remote sensing, is the science and practice of obtaining information about objects, areas, or phenomena from a distance, typically using aircraft or satellites. Sensors measure reflected or emitted electromagnetic radiation across visible, infrared, thermal, and microwave wavelengths. Remote sensing can be passive, detecting natural energy such as sunlight or thermal radiation, or active, emitting signals (such as radar or laser) and recording the return.
Data collected by fjärrsensing are processed into imagery or higher-level products. This processing includes radiometric and
Applications of fjärrsensing span many fields. It is used for land-use and land-cover mapping, agricultural monitoring
Key technologies include optical and infrared cameras, hyperspectral imagers, synthetic aperture radar (SAR), and LiDAR. Platforms